James l



(No Model.)

} J. L. FORSAITH.

Lamp.

No. 238,497. I Patented March-8,I-881.

igmnmmm 111 a uni Units STATES JAMES L. FORSAITH, OF SHARPSBURG,PENNSYLVANIA.

LAMP.

SPECIFICATION forming part of Letters Patent No. 238,497, dated March 8,1881. Application filed September 18, 1880. (No model.)

To all whom it may concern:

Be it known that I, JAMEs L. FORSAITH, of Sharpsburg, in the county ofAllegheny, State of Pennsylvania, have invented a new and usefulImprovementin Lamps; and I do hereby declare that the following is afull and ex act description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention relates to an improvement in that class of lamps known asmill, derrick, or torch lamps; and it consists in a wick-tube arrangedat an acute angle to the vertical axis of the body of the lamp, andprojecting a short distance above the bottom of a dished drip-cupsecured to the upper end thereof, and a horizontal tube communicatingwith said dished drip-cup at a short distance above the bottom thereof,and with the body of said lamp at or near the neck thereof and above theoil-level, whereby the oil is prevented from returning to the lamp andis held in the cup for consumption, all as will be hereinafter fullyexplained.

To enable others skilled in the art with which my invention is mostnearly connected to make and use it, I will proceed to describe itsconstruction and operation.

In the accompanying drawings, which form part of my specification,Figure 1 is a side elevation of my improvement in mill, derrick, ortorch lamp. Fig. 2 is a vertical section of the same.

In the accompan yin gdrawings, Arepresents the body of the lamp, and Bthe wick-tubes, which project from the body of the lamp. The upper endsof said wick-tubes are about on a plane with the bottom of the lid orcap 0. The body of the lamp and the wick-tubes are constructed ofsheet-iron and the several joints and seams brazed. Around the upper endof the wick-tube is secured, by brazing, asmall dished drip-cup, D,constructed of malleable iron and thickened up at e, and furnished withan opening having screw-threads for the reception of the outer end ofthe gas-conducting tube f, the other end of which is secured byscrewthreads in the body of the lamp, at g. The screw-thread on the endof the gas-conducting tube at e is right-handed, and on the end at gleft-handed and is secured in place by slightly springing the wick-tubesB outward and then placing the ends of the gas-conducting tubes in theopenings at e and g, and then turning the tube two or more revolutions.The tube B extends a short distance above the bottom ofthedisheddrip-cup D and about on a plane with the lower edge of the opening inthe thickened part 6, whereby the oil flowing from the upper end of saidwick-tube will be retained in the dished drip-cup D and subjected to thevaporizing action of the flame of the burning wick, as hereinafter morefully explained. The cap or lid 0 is secured to the body of the lamp byscrew-threads, as at z, for the purpose of sealing the lamp andpreventing the escape of gas other than that through the gas-conductingtubes f. To the body A, at j, are attached lugs, to which is attached asmall chain, k, which terminates in a hook, I, which chain and book areused for suspending the lamp. To the body A are also attached handles m,for manipulating the lamp.

The lamp hereinbefore described may be constructed with a singlewick-tube and gas-conducting tube and furnished with a handle, asindicated by the dotted lines a. The wicktube may be corrugatedlongitudinally, forming grooves, thereby stiffening the wick-tube andconveying back the unconsuined oil.

The lamp, being filled with oil and the cap or lid 0 being secured inposition and the wicktubes furnished with wicks, is then ready for use.When the wicks are lighted any unconsumed oil at the upper end of thewick-tubes is caught in the dished drip-cups D, and the heat of theflame of the lamp acting thereon converts it into a vapor, which,commingling with the vapor or gas escaping through the gas-conductingtubes f, is ignited, thereby increasing the light.

The advantage of a lamp constructed as hereinbefore described consistsin its being non-explosive and perfectly safe, and the gas generated inthe lamp and the unconsumed oil escaping from the wick-tube, which hashitherto been Wasted, are utilized.

Iam aware that wick-tubes have been provided with dished drip-cups attheirends, having return-tubes to carry the waste oil back to thelamp-body; but I am not aware of any construction substantially likemine for conveying the gas from the lamp to the point of the burningflame, and at the same time holding the waste oil in the drip-cup to beconsumed.

5 Having thus described my improvement,

what I claim is 1. A mill, derrick, or torch lamp having a wick-tubearranged at an acute angle to the vertical axis of the body of the lamp,and pro- 10 jecting a short distance above the bottom of a disheddrip-cup secured to the upper end thereof, and a horizontalgas-conducting tube communicating with said dished drip-cup at a shortdistance above the bottom thereof, and

r 5 with the body of said lamp at or near the neck thereof and above theoil-level, whereby the oil is prevented from returning to the lamp andis held in the cup for consumption, substantially as and for the purposeherein shown and described. 20

2. In a mill, derrick,or torch lamp, the combination of body A, providedwith a screwthreaded opening, the tube 13, having dish D, provided witha screw-threaded opening, and the gas-connecting tube, provided withright 2 5 and left hand screw threads 0 g, substantially as and for thepurpose herein shown and described.

J. L. FORSAITH. WVitnesses:

A. G. JOHNSTON, JAMES J. J OHNSTON.

